Gameboid is an emulator app that allows an Android smartphone to simulate the Game Boy Advance video-game system. The BIOS file is that system's memory, which initializes every time the device is turned on.
BIOS stands for basic input/output system. It is the first item of memory a device runs. A Game Boy Advance needs to load its BIOS before it can load any cartridges or games. For the Gameboid emulator to function or load games, it must first be given the Advance's BIOS file. However, distributing this file can be a copyright violation if the user does not own the correct license or have express permission to do so.